NIT No. 27(2025-26)M-4 ITEM No. 33

Disconnecting HT supply from main panel after switching off 11 KV VCB discharging the supply. Complete drain out of transformer oil from transformer into empty oil drum by oil machine, dismantling of conservator tank and all protection relays, cable end boxes, vent pipes and other items as required.

Cleaning of transformer oil tank and removing of sludge settled in the bottom with the help of vacuum pressure cleaning machine thoroughly, cleaning of core and winding of transformer with hot oil and proper safety precaution to prevent the winding damage as required, cutting of old overheated insulation of winding and re-insulation of weak point with the help of HT insulation material and proper taping etc.

Replacement of top cover gasket vertical vent gasket & missing hardware to stop the oil leakage.

Replacement of silica gel Breather and silica gel.

Checking & matching of control wiring of all protection relays and calibration of buccholz relay and protection relays testing the same.

Complete assembling of transformer cleaning of complete transformer tightening of all connection of incoming and outgoing side and testing & checking of IR test with megger of winding & 1eable of both sides HI pot machine.

Replacement of transformer oil to up to top up level as required. Make - Transpower

Repair of cooling fins for stopping the leakage.

Dehydration & filtration of complete transformer oil and checking the die electric strength up to 50 KV at site.

Complete cleaning and chemically washing of the oily and muddy transformer body and painting of the transformer with enamel paint. The work also includes the transportation of man & material at site of work.